London rapper Plan B scored a chart-topping album with his sophomore release, and Usher his first U.K. No. 1 single for five years, as new sales data was unveiled by the Official Chart Company.

Plan B's "The Defamation of Strickland Banks" (679/Atlantic/Warner Music) proved victorious in a busy week of new entries on the April 18 chart. It's his second album, following 2006's "Who Needs Actions When You Got Words," which peaked at No. 30. The new success comes on the heels of Plan B's current hit "She Said," which hit No. 3 earlier this month and is now at No. 4.

Scouting For Girls' second album "Everybody Wants To Be on TV" (Epic/Sony Music Entertainment), which follows their recent first No. 1 U.K. single "This Ain't A Love Song," was thus limited to a No. 2 debut. With last week's bestseller, Lady Gaga's "The Fame" (Interscope/Universal), down to No. 3, MGMT saw "Congratulations" (Columbia/Sony Music Entertainment) arrive at No. 4.

Joshua Radin, whose first U.K. hit "I'd Rather Be With You" (14th Floor/Warner Music) held at No. 11 on the new singles chart, achieved a No. 9 debut for the album "Simple Times." Meanwhile, "The Very Best of Free & Bad Company" (Rhino/UMTV) showed its staying power with a third week at No. 10.

Usher's "Omg," featuring, climbed 2-1 to become his first U.K. No. 1 since "Burn" hit the summit in 2004. He also reached No. 1 earlier that year with "Yeah," featuring Lil' John and Ludacris, and in 1998 with his debut hit "You Make Me Wanna."

The Scouting For Girls single fell to No. 2, as "I Need You Tonight" (Virgin/EMI) by Professor Green featuring Ed Drewett arrived at No. 3. It's the debut hit for east London rapper Green, who was previously signed to the Beats, the label owned by Mike Skinner of the Streets, before it was dissolved. The new hit is based around INXS' 1987 smash "Need You Tonight."

Kelis' "Acapella" (Interscope/Universal) debuted at No. 5 to become the American star's sixth U.K. top ten hit but first for three years. Also debuting in the singles top ten, at No. 7, was "Naturally" (Hollywood/Universal) by U.S. teen act Selena Gomez & the Scene.

Billboard's current pan-European sales chart show "The Fame" back at No. 1 for Lady Gaga in its 65th week, as her "Telephone" duet with Beyoncé ascends to No. 1 on European Hot 100 Singles.